Motorcycle towing unit



FIG. 1 is a perspective view of a motorcycle towing unit showing my new design;

FIG. 2 is a right side elevational view with the left side being a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a motorcycle towing unit, as shown and described. 